Process of treating metal frictional surfaces



Dec 14 1926. 1,61,927

O. BUTLER.

PROCESS OF TREATING METAL FRICTIONAL SURFACES Filed Feb. 23, 1926 IN VEN TOR.

MTTORNEYS.

Patented Dec. 14, 1926 OBADIAH BUTLER, 0F KILLINGLY, CONNECTICUT.

PROCESS OF TREATING METAL FRICTIONAL SURFACES.

Application filed February as. 1926'." Serial No. 90.097.

This invention relates to a process of treating metal frictional surfaces, and the object of the invention is the construction of a simple, effective and eflicient metal frictional surface that includes certain specific means for increasing the power which .the metal frictional surface transfers to the surface coming in contact with it, and for increasing the hold and grip which the metal frictional surface has upon the material that comes in touch with it, thus rendering the metal frictional surface more efficient and useful.

\Vith this and other objects in view, my invention comprises certain novel construe tions, finishings, .and treatments of metal frictional surfaces as will be hereinafter described, illustrated in the accompanying.

entire surface of the element, in accordancewith the present invention.

Figure 2 is a sectional view of a rotatable element, preferably in a knitting machine, showing a strand of yarn passing over or around the element, while Figure 3 is an enlarged fragmentary view of the element shown in Figure 2, for illus trating the manner of engagement, and the gripping action of the yarn and element.

Referring to the drawings by numerals, designates the rotatable element or pulley, on .spindle 2, said pulley having its smooth surface, as shown at 3, roughened-up by,

preferably,a direct sand blast, playing upon the surface to cause a uniform, minute pittingor roughening-up of the surface, as at 4, better shown in Figure 3, for slightly entering the yarn or strand 5 for the purpose hereinafter more fully explained. I have illustratedthe specific process in Figures 1 to 3, wherebymy invention is reduced to practice, which causes metal frictional sur faces to be roughened sufficiently to increase The advantage of my process of a rough- Y ened metal frictional surface lies in the fact 1 that the roughened surface holds the matter that comes in contact with it from slip ping; and. therefore, if the'contact is for the purpose of transmitting power, as by an or-' dinary belt (not shown) by doing away with the slipping. more power is transferred. If

the matter that comes in contact with it is pulled and drawn. as is the thread and yarn illustrated in Figures 2 and, 3, then it pulls or draws the thread more certainly and increases the amount thrown.

Another advantage is that it prevents the surface that comes in contact with the metal. frictional surface from slipping off sideways, as a belt slipping off the pulley, or the yarn slipping over the apex of a cone (not shown). These. roughened surfaces are more effective than other regularly circumferential strips of nurling spaced laterall. one from the other and extending acrossl the rim surface and are an improvement thereover.

While I have described the preferred embodiment of my invention and have illustrated the same in the accompanying drawings, certain minor changes or alterations 'may appear to one skilled inthe art to which this invention relates during the eX- tensive manufacture of the same, and I,

therefo e, reserve the right to make such changes or alterations as shall fairly fall within the scope of the appended claim.

What I claim is: I

The process of treati g metal frictional surfaces, comprising su jecting the smooth travelling-element engaging surface of a rotary element to a sand blast to cause a uniform pitting smooth surface.

.In testimony whereof I hereunto affix my signature.

or roughe'ning-up of said OBADIAH BUTLER. 

